Personal Info
- Country of residence: Portugal
Information
OTHMAN H. Y. ZALLOUM, PhD, MInstP, CPhys,
ASSOCIATE PROFESSOR OF PHYSICS
Personal and Contact Information
Palestine Polytechnic University
College of Applied Sciences
Department of Applied Physics and Electronics
Phone: +(972) 2-223305
Email: ozalloum@ppu.edu
EDUCATION
1994 Ph. D. (Physics)
The National University of Ireland, University College Dublin, Dublin, Ireland.
1991 M. Sc. (Physics)
The National University of Ireland, University College Dublin, Dublin, Ireland.
1990 B. Eng.(Honors)
The National University of Ireland, University College Dublin, Dublin, Ireland.
1986 National Certificate in Electronics Engineering,
Waterford Institute of Technology, Ireland.
POSTDOCTORAL APPOINTMENTS AND TEACHING EXPERIENCE
Associate Professor in Physics Palestine Polytechnic
University
07/2012 – Present
Assistant Professor in Physics
Palestine Polytechnic University
08/2010 – 07/2012
Research Scientist*
University of Tennessee Space Institute, USA
05/2008 – 03/2010
Research Associate*
McMaster University, Hamilton, Ontario, Canada
03/2004 – 12/2007
Research Associate*
Johns Hopkins University, Maryland, USA
01/2003 – 12/2003
Assistant Professor in Physics
Palestine Polytechnic University, Hebron, Palestine
09/1998 – 10/2002
Assistant Professor in Physics Zarqa University, Jordan
09/1997 – 09/1998
Assistant Professor in Physics Al-Zaytoonah University of Jordan,
Jordan
02/1995 – 09/1997
*Over the period 10/2002 – 08/2010, I was an Assistant
Professor in Physics on a Leave of Absence from
the Palestine Polytechnic University.
POSTDOCTORAL RESEARCH EXPERIENCE
1. The University of Tennessee, Space Institute, Goethert
Parkway, Tullahoma, TN, 05/2008 –
03/2010.
I was a research scientist at the University of Tennessee
Space Institute with Professor William
Hofmeister. The research can be divided into the following
categories:
i. Development of an amplified femtosecond laser system for
material micro/nanostructuring with
an integrated Raman microscope.
In order to obtain new insights into laser-induced chemical
material modifications, I have led the team
to introduce a novel combined approach of femtosecond pulsed
laser-direct writing and in situ Raman
microscopy within a single experimental apparatus. We have
developed a new scanning microscope,
the first of its kind, which provides a powerful tool for
micro-/nanomachining and characterization of
material properties and allows us to relate materials'
functionality with composition. We addressed the
issues of light delivery to the photomodification site and
showed the versatility of the system using
tight focusing. Amplified femtosecond pulses were generated
by a Ti:sapphire laser oscillator and a
chirped-pulse regenerative amplifier, both pumped by a
diode-pumped frequency doubled
neodymium-doped yttrium orthovanadate (Nd:YVO(4)) laser
operating at 532 nm. The research
involved the application of Raman spectroscopy and scanning
electron microscopy imaging of
femtosecond laser micro-/nanomachining on the surface and in
the bulk of single-crystal diamond.
This effective combination helps to shed light on the
influence of the local structure fluctuations on
controllability of the laser processing and the role of the
irradiation in the ablation processes ruling
out possible imprecisions coming from the use of the two
independent techniques. The results of this
research was published in the refereed Journal: Rev. Sci.
Instrum. 2010 May;81(5):053906. doi:
10.1063/1.3430073.
ii. Femtosecond micromachining of HPHT single-crystal
diamond with direct laser writing using
tight focusing.
We investigated the formation of diversiform
micro-/nano-structures in High-Pressure High-
Temperature (HPHT) synthetic single-crystal diamond by
tight-focusing 200 fs regeneratively
amplified Ti: Sapphire laser pulses centered at λ = 800 nm.
Ablated samples of synthetic single crystal
nanodiamond and their acetate replicas were analyzed using
scanning electron microscopy (SEM).
Using pulse energies that were significantly above the threshold
for permanent change, it was shown
from this work that amplified femtosecond pulses were
capable of producing controlled modification
of HPHT single-crystal diamond at size scales below the
diffraction limit and provided negligible
collateral heating and shock-wave damage. This was
attributed to the low thermal losses and negligible
hydrodynamic expansion of the ablated material during the
femtosecond laser pulse. It was shown that
low pulse energy is a key factor for the accurate and
precise machining of micropattems. This work
was published in Optics Express, Vol. 18, Issue 12, pp.
13122-13135 (2010).
iii. Worked on the design of new, advanced and durable
Silicon-based sensors to measure acceleration,
strain and temperature of structural components on
high-temperature aerospace materials in extreme
environments. Applications of these sensors in high thermal
(>1800oF) and acoustic loads include air-
breathing and rocket propulsion systems, airframe and
spacecraft structures and hypersonic vehicle
systems.
iv. Given the responsibility to teach special topics for the
graduate programs (MS and PhD) and was
involved in the teaching of Pulsed Laser Deposition (PLD) at
the University of Tennessee Space
Institute. The PLD method of thin film growth involves
evaporation of a solid target in an ultra-high
vacuum chamber by means of short and high-energy laser
pulses.
2. McMaster University Faculty of Engineering Physics,
Hamilton, Ontario, Canada, 03/2004 -
12/2007.
I was a research associate in the Thin Film Laboratory of
Professor Peter Mascher for the period from
March 2004 to December 2007. I have been actively involved
in the advanced characterization of new
silicon-based semiconductor nanoclusters with or without
rare-earth doping. The research can be
divided into the following four categories:
i. Silicon nanocrystals – a major focus of my research has
been the exploration and description of the
formation of silicon nanocrystals in silicon-rich oxides,
nitrides, and oxy-nitrides, produced by post-
deposition annealing of thin films grown by ECR-PECVD or
inductively coupled plasma (ICP) CVD.
Of particular interest are the effects of annealing in
materials that are highly silicon rich, for
applications in future nano-photonic devices. For such
devices, nano-structured silicon shows
substantial promise as quantum confinement effects make
luminescence possible, which serves as the
foundation of the rapidly emerging field of silicon
photonics.
ii. Rare-earth-doped structures - in collaboration with
industrial partners, we have demonstrated very
high, optically active concentrations of Er, Td, Ce, and Eu
by using in-situ doping processes. Studies
at the Canadian Light Source synchrotron facility have
provided critical information on the
luminescence mechanisms and the incorporation
characteristics of the RE in various Si-based
matrices. Most exciting from a practical perspective is the
potential for tunability of the emission
wavelength and/or the generation of white light.
iii. Synchrotron studies - A more and more important aspect
of our work is the application of
synchrotron-based techniques to the investigation of the
luminescence mechanisms in rare earth
doped, silicon-based structures. The results provide
evidence that luminescence from these materials
is correlated with the excitation of O-related energy
states, and demonstrate that the composition and
bonding structure of the silicon oxide host matrix play an
active role in determining the luminescent
properties, even though the microstructure of the films may
vary from sample to sample. In order to
optimize the luminescence from such materials it is,
therefore, necessary to consider the local bonding
environment of the RE-ions and specific details of
electronic states associated with the host matrix.
This research has potential applications for use in a
variety of applications including solid state lighting
and solar cells. Semiconductor nanoclusters can be utilized
to produce novel lasers and optical devices
and can be used as a monolithically integrated silicon-based
emitter for optical telecommunications.
My contributions in this area have led to the publication of
a series of groundbreaking findings in top-
ranked scientific journals and in many more refereed conference
proceedings, in addition to many
presentations at local and international conferences and
symposia.
iv. Development of New Electro-Optical Characterization
Facilities - I have developed new electro-
optical characterization facilities for photonic materials
and devices. These facilities now contribute
to the optical, electrical and spectroscopic
characterization of light emitting nanostructures both at
room and cryogenic temperatures and have fostered
relationships with industry and are a great
networking tool. One of the systems was published in the
American Institute of Physics Journals
“Review of Scientific Instruments” under the title “Laser
Photoluminescence Spectrometer based on
CCD detection for Silicon Based Photonics”.
3. The Johns Hopkins University, School of Medicine, The
Wilmer Ophthalmological Institute,
The John Hopkins Hospital, January 13, 2003 – December 31,
2003.
I have joined Professor David Guyton’s group for a one-year
Research Fellowship in Ophthalmic
Instrumentation, and I was soon promoted to Research
Associate in Ophthalmology (faculty rank).The
primary projects that I have contributed to were
applications in pediatric vision screening, remote
control via visual fixation, monitoring of eye alignment,
and eye tracking.
I conducted a comprehensive PSpice simulation of a complete
and sophisticated electronic control
system for retinal birefringence scanning devices. In my
work, I have modeled the electronic signal
processing unit used to measure changes in retro-reflected,
polarized, near-infrared light to detect the
projection into space of the uniquely oriented nerve fibers
surrounding the fovea (the area of the retina
used for fixation). I have also contributed significantly to
the optical and mechanical designs of a new
no-moving-parts eye fixation monitor. The advantages of this
new device are that it:(i) requires no
calibration for each subject, (ii) avoids the added noise
and vibration from a rapidly spinning motor as
normally required for retinal birefringence scanning
devices. The results of this study were published
in detail in the Journal of Biomedical Optics, a favorite
journal for peer-reviewed papers that utilize
modern optical technology for improved health care and
research.
A further development stemming from my contributions was
reported in: “Directional eye fixation
sensor using birefringence-based foveal detection” published
in the peer-reviewed journal Applied
Optics. This paper demonstrated the feasibility of an eye
tracker sensor that utilizes birefringence-
based foveal position detection. The method and device can
be used for remote, noninvasive
continuous monitoring of foveal fixation within ±1 degree in
both the horizontal and the vertical
directions, but at a relatively slow speed. The field can
potentially be expanded by using other
birefringence structures of the fundus of the eye such as
the retinal nerve fiber layer around the optic
disc. The other advantage of this approach is that it
requires no rigid head fixation and needs no head-
mounted appliances. The potential widespread use or
application of this sensing technology includes
remote control and security applications via visual
fixation, aids for disabled individuals, and other
areas of environmental control via visual fixation.
I also contributed to the subjects of two platform
presentations at the Annual Meeting of the
Association for Research in Vision and Ophthalmology in
2004, and the publication of a brief
summary paper in the Biomedical Optics and Medical Imaging
section of SPIE Newsroom. The paper
was entitled “Changing polarization of foveal nerve fibers
in the eye allows detection of central
fixation”.
TRAINING COURSES
Fellowship in Medical Physics, Queensland University of
Technology, School of Physical and
Chemical Sciences, Brisbane, Queensland, Australia,
15/07/2013 – 17/09/2013.
I was awarded a Fellowship Placement by the International
Atomic Energy Agency (IAEA) in Vienna
to undertake a two-month placement in Australia in the
Science and Engineering Faculty, Queensland
University of Technology (QUT). The fellowship was related
to the IAEA's TC project entitled:
Supporting Education and Training in Radiation Protection
and Medical Physics (Oracle Project
Number:3060293) (PAL9007).The fellowship placement was
coordinated by The Australian Nuclear
Science and Technology Organisation (ANSTO), and was
intended to provide an in depth exposure to
a research and academic environment as well as the skills
and experience to effectively teach in a
medical physics program. During the course of the
fellowship:
1. I undertook a period of education, training and research
in Medical Physics that included participation
in lectures and tutorials for the following units that forms
part of the coursework component of the
QUT Masters in Medical Physics Program:
• PCN212 Radiotherapy Physics
• PCN112 Medical Imaging Science
• PCN214 Health and Occupational Physics
These units comprise lectures, tutorials and practical
classes, some of which are in clinical
departments.
2. I Gained experience and knowledge related to the
Training, Education and Accreditation Program
(TEAP) run by the Australasian College of Physical
Scientists and Engineers in Medicine (ACPSEM)
and how it has been implemented in Queensland.
3. I Learned about the current research projects in medical
physics currently being carried out at QUT
and elsewhere in Brisbane.
PCN214 Health and Occupational Physics
The content of the Health and Occupational Physics course
includes history of safety provisions,
responsibility, legislation; Role of safety officer,
medico-legal implications; Causes of accidents,
human error; Hazard analysis, system safety planning;Instrumental safety – dialysis; Electrical
hazards; Electrical protection; Nonionizing-electromagnetic
radiation hazards; Lasers; UV radiation;
Philosophy of radiation protection; absorbed, equivalent and
effective dose; radiation weighting
factors; organ weighting factors; stochastic and
deterministic effects; recommendations on radiation
dose limits; external and internal exposure; ingestion and
inhalation; derived limits; codes of practice;
potential exposure and constraint; Biological effects and
risks to populations; Radiation protection in
medical areas; radiation protection in mining and milling of
radioactive ores; radioactivity in soil,
water, air and biota; pathway analysis; radiation protection
in other professional situations, transport,
disposal, storage and handling of radioactive materials;Radiation shielding.
PCN112 Medical Imaging Science
The content of the Medical Imaging Science course includes:
Nuclear Medicine: Radionuclide
selection; production and quality control; Pharmaceutical
selection and organ localisation; Preparation
of "kits" and quality control; Imaging Systems:
The gamma camera - principle of image formation,
collimators, resolution, factors affecting image quality;dynamic imaging; NEMA quality control;
Principles of SPECT and PET; Butterworth and resolution
recovery filters; Iterative reconstruction
including OSEM; Attenuation correction and scatter
correction leading to quantitative SPECT; PET
scintillators and their properties, 2D versus 3D PET
systems; Internal dosimetry including the MIRD
method; Foetal dosimetry including placental transfer,
comparisons with doses in diagnostic
radiology; Methods of patient-specific dosimetry for therapy
applications including dose kernel
convolution and Monte Carlo techniques; Absolute activity
estimation from geometric mean planar
images; Patient related radiation safety issues including
concerns regarding pregnant/ lactating/
paediatric patients, doses to carers and friends, discharge
requirements for patients after radionuclide
therapy. Clinical applications: i) Programming: Introduction
to SciLab and SciLab graphics; Matrix
operations; Programming with SciLab. Control structures.
Functions; Reading and displaying images
with SciLab; the digital image: pixels, binary numbers,
palettes, look-up tables, windowing; ii) Image
processing: histograms, contrast stretching, histogram
equalisation, spatial filtering, frequency
filtering; Image quality: contrast, noise, S/N ratio,
spatial resolution, modulation transfer function;
Visual perception, contrast-detail-diagram, receiver
operating characteristic.
PCN212 Radiotherapy
The content of the Radiotherapy course includes:
Radiotherapy and its role in the treatment of cancer;
Basic radiation physics; Dosimetric Principles, Quantities
and Units; Radiation Dosimeters; Radiation
Monitoring Instruments; External Beam Radiotherapy
Equipment; Physical Aspects of External
Photon Beams; Clinical Treatment Planning; Physical and
Clinical Aspects of Electron Beams;
Calibration of photon and electron beams; Acceptance Tests
and Commissioning; Quality Assurance
of external beam radiotherapy; Physical and Clinical Aspects
of Brachytherapy; Basic Radiobiology;
Special Procedures and Techniques in Radiotherapy including
stereotactic, Total body irradiation
(TBI), Intraoperative Radiotherapy, Conformal and Intensity
Modulated Radiotherapy (IMRT), Image
- Guided Radiotherapy, Heavy Ion and Proton Therapy;Radiation Protection and Safety. The practical
work consisted of attending five practical sessions. Four of
these were at the Mater Public Hospital.
RECENT GRADUATION SEMINARS UNDER MY SUPERVISION
(All were nominated to the Student Innovation Conference
(SIC) held at the Palestine Polytechnic
University in the academic years 2013-2014 and 2014-2015 and
appeared in the SIC handbooks).
1. Biological and Physical Effects of Nuclear Radiation,
Intesar Zalloum, Atheer Shamisti, Dujana
Kamal, and Othman Zalloum
2. SPECT and PET: principles, Strengths and Recent
Advancements, Mai Zalloum, Esra'a
Alkdoor, Ghadeer Qawasmi, and Othman Zalloum
3. Advances in Brachytherapy, Bayan Alsalaymeh, Shatha
Aljunaidi, and Othman Zalloum
4. Recent Advances in Medical Ultrasound Imaging, Abeer
Shabaneh,Rawdah Awawdeh,Maram
Doudin, and Othman Zalloum
PROFESSIONAL SOCIETIES
Member, Institute of Physics (MInstP, CPhys), United Kingdom
Member, European Optical Society (MEOS), France
Member, American Optical Society
HONORS AND AWARDS
1990
Canon Scholarship Award and Certificate of Distinction from
Cantec in Association with the
Dublin Institute of Technology for outstanding project work
at University College, Dublin.
1990 Full scholarship
for Masters Degree research study at University College Dublin.
1991 Full scholarship
for Doctor of Philosophy research study at University College Dublin.
1995 Chartered
Physicist, CPhys, Institute of Physics, United Kingdom.
2003 Executive Vice
President of Johns Hopkins Postdoctoral Association
PEER REVIEWER
• “Applied Physics Letters”
• “Optics Express”
• “Optics Letters”
• “Optical Engineering”
• “Review of Scientific Instruments“
• “Nanotechnology”
• “Semiconductor Science and Technology”
SYNERGISTIC ACTIVITY
• Point of contact (coordinator) at the PPU to communicate
with the National Committee for the
Management Program of Cooperation between Palestine and the
International Atomic Energy
Agency (IAEA).
• Head of the scientific committee for the Faculty of
Applied Sciences at the Student Innovation
Conference on held on 18/06/2014 at the PPU.
• Member of the Scientific Committee at the Palestinian
Conference on Graduate Student Research
in Natural and Applied Sciences on held on 22 March 2014 at
Birzeit University.
• Member of the scientific committee at the Student
Innovation Conference held on 12/06/2013 at
the PPU.
• Physics Chair in the Third Palestinian Conference on
Modern Trends in Mathematics and Physics
(PCMTMP)” held on July 16-18, 2012 at the Palestine
Polytechnic University in Hebron,
Palestine.
• Service in many university committees. First-hand
experience in curriculum reform and
development. Played a key role in managing contacts with
industrials partners and key research
collaborators.
COURSES TAUGHT AND DEVELOPED
Physics of Medical Imaging, Radiation Physics, Radiation
Protection and Safety, Modern Physics,
Optics, Physics of Sensors, Classical Mechanics, Statistical
Mechanics and Thermodynamics,
Mathematical Physics, Quantum Mechanics, Electronics and
Laboratories, General Physics Series,
General Physics Laboratories, Intermediate Physics
Laboratories, Advanced Physics Laboratories,
Graduation Seminars
ENGINEERING COURSES TAUGHT AND DEVELOPED
Measurements and Sensors, Metrology, Instrumentations and
Sensors are taught for engineering
students in Palestine Polytechnic University. In addition, I
supervised a number of graduation research
projects.
COMPUTER SKILLS
• Optical design and modeling tools (Code V, OSLO,
OpticsLab, RSoft, BeamPROP™ and
FullWAVE™, CircuitMaker).
• Modeling, simulation studies and monte carlo methods in
Physics. Special interest applies to
radiation transport, radiative transfer calculations,
light-matter interaction, and the angular
distribution of light scattering in the form of laser
diffractometry.
• Fluency with data analysis software such as Matlab,
OrginLab, and MathCad. Development of
high speed data acquisition software and instrument control
using LabVIEW.
• Acquainted with web-based course delivery tools such as
Virtual Blackboard and E-Learning
methods, and educational technology applications.
PUBLICATIONS
1. Zalloum, O. H. Y., Parrish M, Terekhov A, Hofmeister W
”An amplified femtosecond laser
system for material micro-/nanostructuring with an
integrated Raman microscope” Review of
scientific instruments, 81(5):053906- (2010) Selected for
the June 2010 issue of Virtual Journal
of Ultrafast Science.
2. Zalloum, Othman H. Y. , Matthew Parrish, Alexander
Terekhov, and William Hofmeister “On
femtosecond micromachining of HPHT single-crystal diamond
with direct laser writing using tight
focusing” Optics Express, Vol. 18, Issue 12, pp. 13122-13135
(2010). Selected by Virtual Journal
of Ultrafast Science. / Volume 9 / Issue 8 / Condensed
Matter Physics (2010)
3. Roschuk, T, P.R.J. Wilson, J. Li, O.H.Y. Zalloum, J.
Wojcik, and P. Mascher, “Structure and
luminescence of rare earth-doped silicon oxides studied
through their X-ray absorption near edge
structure and X-ray excited optical luminescence”, physica
status solidi B 1-6 (2009) /DOI
10.1002/PSSB.200945531- Editor’s Choice Volume 247, Issue 2,
pages 248–253, February 2010,
Wiley Online Library, (2010).
4. Blakie D. E., O. H. Y. Zalloum, J. Wojcik, E. A. Irving,
A. P. Knights, P. Mascher, and P. J.
Simpson. “Photoluminescence and positron annihilation
spectroscopy of MeV Si+ ion-irradiated
SiyO1−y:Er (y ≈ 1/3) thin films.” Journal of Applied Physics
105, 053517. (2009).
5. Li J., Othman Zalloum, Tyler Roschuk, Chenglin Heng,
Jacek Wojcik, and Peter Mascher “The
formation of light emitting cerium silicates in cerium-doped
silicon oxides” Applied Physics
Letters 94, 011112 (2009)
6. Heng, C. L., E. Chelomentsev, O. H. Y. Zalloum, J. Wojcik
and P. Mascher “Photoluminescence
from Er-doped Si-rich Si oxides deposited by magnetron
sputtering in Ar or Ar+H2 plasma”
Journal of Vacuum Science & Technology A: Vacuum, Surfaces,
and Films, 27(1): pp. 101-108
(2009).
7. Li J., O. H. Y. Zalloum, T. Roschuk, C. L. Heng, J.
Wojcik, and P. Mascher, “Light Emission
from Rare-Earth Doped Silicon Nanostructures,” Advances in
Optical Technologies, vol. 2008,
Article ID 295601, doi:10.1155/2008/295601 (2008).
8. Heng, C. L., O. H. Y. Zalloum, J. Wojcik, T. Roschuk, and
P. Mascher, “On the effects of double-
step anneal treatments on light emission from Er-doped
Si-rich silicon oxide” Journal of Applied
Physics 103, 024309 (2008).
9. Heng, C.L., O. H. Y. Zalloum, T. Roschuk, D. Blakie, J.
Wojcik and P. Mascher.
"Photoluminescence studies for an Er-doped Si-rich SiOx
film: effects of annealing gas ambients
and double-step processes.” Electrochem. Solid-State Lett.
10, pp. K20-K23 (2007).
10. Gramatikov, B. I., O. H. Y. Zalloum, Y. K. Wu, D. G.
Hunter and D. L. Guyton. "Directional eye
fixation sensor using birefringence-based foveal
detection."Applied Optics 46(10): pp. 1809-1818
(2007).
11. Comedi, D., O. H. Y. Zalloum, J. Wojcik and P. Mascher.
"Light emission from hydrogenated
and unhydrogenated Si-nanocrystal/Si dioxide composites
based on PECVD-grown Si-rich Si
oxide films." IEEE Journal of Selected Topics in
Quantum Electronics 12(6), pp. 1561-1569
(2006).
12. Pi, X. D., O. H. Y. Zalloum, A. P. Knights, P. Mascher
and P. J. Simpson. "Electrical conduction
of silicon oxide containing silicon quantum dots."
Journal of Physics-Condensed Matter 18(43):
pp. 9943-9950 (2006).
13. Gramatikov, B. I., O. H. Y. Zalloum, Y. K. Wu, D. G.
Hunter and D. L. Guyton (2006).
"Birefringence-based eye fixation monitor with no
moving parts." Journal of Biomedical Optics
11(3), 034025 (2006).
14. Comedi, D., O. H. Y. Zalloum, E. A. Irving, J. Wojcik
and P. Mascher. "H-induced effects in
luminescent silicon nanostructures obtained from plasma
enhanced chemical vapor deposition
grown SiyO1-y: H(y > 1/3) thin films annealed in
(Ar+5%H2)." Journal of Vacuum Science &
Technology A 24(3): pp. 817-820 (2006).
15. Pi, X. D., O. H. Y. Zalloum, T. Roschuk, J. Wojcik, A.
P. Knights, P. Mascher and P. J. Simpson.
"Light emission from Si nanoclusters formed at low
temperatures." Applied Physics Letters
88(10). 103111 (2006).
16. Zalloum, O. H. Y., M. Flynn, T. Roschuk, J. Wojcik, E.
Irving and P. Mascher. "Laser
photoluminescence spectrometer based on charge-coupled
device detection for silicon-based
photonics." Review of Scientific Instruments 77(2),
023907 (2006).
17. Comedi, D., O. H. Y. Zalloum, E. A. Irving, J. Wojcik,
T. Roschuk, M. J. Flynn and P. Mascher.
"X-ray-diffraction study of crystalline Si nanocluster
formation in annealed silicon-rich silicon
oxides." Journal of Applied Physics 99(2), 023518
(2006).
18. Comedi, D., O. H. Y. Zalloum and P. Mascher.
"H-sensitive radiative recombination path in Si
nanoclusters embedded in SiO2." Applied Physics Letters
87(21) (2005).
19. Pi, X. D., O. H. Y. Zalloum, J. Wojcik, A. P. Knights,
P. Mascher, A. D. W. Todd and P. J.
Simpson. "Formation and oxidation of Si nanoclusters in
Er-doped Si-rich SiOx." Journal of
Applied Physics 97(9): 096108-096108-3 (2005).
20. Zalloum, O. H. Y. "Design of a modern optical fibre
spectral transmissometer and a 120 degrees
scattering meter." Journal of Optics-Nouvelle Revue D
Optique 29(2), pp. 53-62 (1998).
21. Zalloum, O., E. O’Mongain, J. Walsh, S. Danaher and L.
Stapleton. "Dye Concentration
Estimation by Remotely-Sensed Spectral Radiometry."
International Journal of Remote Sensing
14(12), pp. 2285-2300 (1993).
22. Wilson, P.R.J., T Roschuk, O.H.Y. Zalloum, J. Wojcik,
and P. Mascher. “The Effects of
Deposition and Processing Parameters on the Electronic
Structure and Photoluminescence from
Nitrride-Passivated Silicon Nanoclusters” . ECS Trans. 16,
(21) 33-41 (2009).
23. Heng, C.L., O.H.Y. Zalloum, E. Chelomentsev and P.
Mascher. “Photoluminescence from
magnetron-sputtered SiO2 films co-doped with (Er, Ge) under
excitation of a 325 nm He-Cd laser
line." ECS Trans. 6, (3) pp. 549-559 (2007).
24. Roschuk, T., O. H. Y. Zalloum, J. Wojcik, H. Zhang, and
P. Mascher . “A Comparison of the
Effects of Silicon Oxide and Silicon Nitride Host Matrices
on the Photoluminescence from Si
Nanocrystals after High Temperature Annealing”. ECS Trans.
6, (3) pp. 523-529 (2007).
25. Wojcik J, T. Roschuk, O.H.Y. Zalloum, C.L. Heng, D.E.
Blakie, A.P. Knights, and P. Mascher
"Fabrication and Characterization of Silicon
Nanostructures for Integration in Photonics Devices
and Circuits", Society of Vacuum Coaters 505/856-7188,
50th Annual Technical Conference
Proceedings, ISSN 0737-5921 pp. 334-337 (2007).
26. Blakie, D. E., O. H. Y. Zalloum, J. Wojcik, E. J.
Irving, A. P. Knights and P. Mascher "Coupled
luminescence centres in erbium-doped silicon rich silicon
oxide thin films." Proc. SPIE 6343,
63433S (2006).
27. Comedi, D., O. H. Y. Zalloum, D. E. Blakie, J. Wojcik
and P. Mascher. "Formation of and Light
Emission from Si Nanocrystals Embedded in Amorphous Silicon
Oxides." ECS Trans. 3, (11)
pp:3-8 (2006).
28. Flynn, M., O. H. Y. Zalloum, J. Wojcik, I. Calder, S.
Gujrathi, S. Hill and P. Mascher. "The
Impact of the Rare-earth Precursor on the Composition,
Structure and Luminescence of Er-doped
Silicon-rich Silicon Oxide Films." Published in: Group
IV Photonics, 3rd IEEE International
Conference on Group IV Photonics, Ottawa, Canada. pp: 46-48,
ISBN: 1-4244-0096-1, INSPEC
Accession Number: 9274170, Digital Object Identifier:
10.1109/GROUP4.2006.1708160 (2006).
29. Blakie, D., O. H. Y. Zalloum, J. Wojcik, E. J. Irving,
A. P. Knights and P. Mascher. "Erbium
doped silicon rich silicon oxide luminescent thin films
deposited by ECR-PECVD." Proc. SPIE
5970, 597013 (2005).
30. Roschuk, T., Wojcik, J., Comedi, D., Flynn, MJ., Irving,
E.A., Zalloum, O.H.Y., and Mascher,
P.“Optical Properties of Nanostructures based on Silicon
Rich Silicon Oxide Thin Films” in Proc.
of the 207th Electrochemical Society Meeting, Quebec city,
Canada, May 15-20. PV 2005-01 -
ISBN 1-56677-459-4 - Silicon Nitride and Silicon Dioxide
Thin Insulating Films and Other
Emerging Dielectrics VIII. Editors: R. E. Sah, M. J. Deen,
J. Zhang, Y. Yota, and Y. Kamakura.
pp. 136-147 (2005). http://www.ecampus.com/book/1566774594
31. Gramatikov, B., O. Zalloum, Y.-K. Wu, D. Guyton and D.
Hunter "Changing polarization of
foveal nerve fibers in the eye allows detection of central
fixation." The International Society for
Optical Engineering, SPIE Newsroom Article in Biomedical
Optics & Medical Imaging, DOI:
10.1117/2.1200608.0351 (2006), http://spie.org/x8630.xml
32. Wilson P. R. J., T. Roschuk, O. H. Y. Zalloum, J.
Wojcik, and P. Mascher. “The Effects of
Deposition and Processing Parameters on the Electronic
Structure and Photoluminescence from
Nitride-Passivated Silicon Nanoclusters.” 214th ECS Meeting,
Volume 16, Issue 21 Science and
Technology of Dielectrics for Active and Passive Devices,
Honolulu, HI, USA. (2008).
33. Knights A P, D E Blakie, O H Y Zalloum, J Wojcik, P
Mascher, and P J Simpson. “Impact of
defect introduction on Er3+ luminescence fromSiyO1-y:Er (y=1/3)
thin films characterized by
photoluminescence and positron annihilation Spectroscopy”212th ECS Meeting, Abstract #1179,
The Electrochemical Society, Washington DC, USA. (2007).
34. Roschuk T., J. Wojcik, M. Flynn, E. A. Irving, D.
Comedi, O. Zalloum, and P. Mascher. “A
comparison of luminescent silicon nanocrystals formed in
silicon rich silicon oxide thin Films
deposited by ECR-PECVD and ICP-CVD.” 13th Int. Symp.
“Nanostructures: Physics and
Technology” St Petersburg, Russia, June 20-25, 2005.
35. Comedi D., O.H.Y. Zalloum, E.A. Irving, J. Wojcik, and
P. Mascher. “Enhanced
photoluminescence from nano-structured silicon-rich
silicon-oxide (SRSO) Films fabricated by
ECR-PECVD and thermally annealed in (Ar+5%H2)”. 13th Int.
Symp. “Nanostructures: Physics
and Technology” St Petersburg, Russia, June 20-25, 2005.
CONFERENCES
1. “Effect of Sample Temperature on Photoluminescence (PL)
Centers in Er-Doped SiyO 1-y (y ≥0.32)
Thin Films” Presentedat the Third Palestinian Conference on Modern Trends in Mathematics
and Physics (PCMTMP) which was held on July 16-18, 2012 at
the Palestine Polytechnic
University in Hebron, Palestine.
2. “Nanomaterials for Sustainable Energy Future; Focus on
Energy Conversion.” Oak Ridge
National Laboratories, (September 25, 2008).
3. P. R. J. Wilson, T. Roschuk, O. H. Y. Zalloum, J. Wojcik,
and P. Mascher.“The Effects of
Deposition and Processing Parameters on the Electronic
Structure and Photoluminescence from
Nitride-Passivated Silicon Nanoclusters’, 214th ECS Meeting
- Honolulu, HI, (October 12 -
October 17, 2008).
4. Chen, C., C. Fradin, R.R. LaPierre, O.H.Y. Zalloum, and
P. Mascher, “Growth of Be-doped
AlGaAs nanowires by molecular beam epitaxy and their
temperature dependent
photoluminescence properties”, NanoForum CANADA, University
of Waterloo, Waterloo,
Ontario, Canada, (June 18-June 20 2007).
5. Flynn, M., O.H.Y. Zalloum, J. Wojcik, I. Calder, S.
Gujrathi, S. Hill, and P. Mascher, “The Impact
of the rare-earth precursor on the composition, structure
and luminescence of Er-doped silicon-
rich silicon oxide films” 3rd IEEE International Conference
on Group IV Photonics, Ottawa,
Ontario, Canada, (September 13-15 2006).
6. Heng, C., E. Chelomentsev, O. Zalloum, and P. Mascher,
“The micro-structural study and
photoluminescence from SiO2 films co-doped with Ge, Er and
Au (or Ag).” 212th Electrochemical
Society Meeting, Washington, DC, USA, (7-12 October
2007).
7. Heng, C.L., O.H.Y. Zalloum, E. Chelomentsev, and P.
Mascher, “Study of the photoluminescence
in (Er, Ge) co-doped SiO2 films and in (Er, Ge, Si) co-doped
SiO2 films”, 19th Canadian Materials
Science Conference, McMaster University, Hamilton, Ontario,
Canada, (June 20-22 2007).
8. Heng, C.L., O.H.Y. Zalloum, E. Chelomentsev, J. Wojcik,
and P. Mascher, A compare study on
the photoluminescence of Er-doped Si-rich SiOx films
fabricated by plasma enhanced chemical
vapor evaporation and magnetron sputtering, NanoForum
CANADA, University of Waterloo,
Waterloo, Ontario, Canada, (June 18-June 20 2007).
9. Knights, A., D. Blakie, O. Zalloum, J. Wojcik, P.
Mascher, and P. Simpson., Impact of defect
introduction on Er3+ luminescence from SiyO1-y:Er (y<1/3)
thin films characterized by”
photoluminescence and positron annihilation spectroscopy, 212th
Electrochemical Society
Meeting, Washington, DC, USA, ( 7-12 October 2007).
10. Li, J., O. Zalloum, J. Wojcik, and P. Mascher,
Fabrication and characterization of rare-earth-
doped silicon oxide structures, 19th Canadian Materials
Science Conference, McMaster
University, Hamilton, Ontario, Canada, (June 20-22
2007).
11. Milgram, J.N., J. Wojcik, O. Zalloum, P. Mascher, and
A.P. Knights, Integrating luminescent Si
nanocrystal films into low loss optical waveguides, SPIE
Photonics West: OPTO 2007, San
Jose,California, USA, (20-25 January 2007).
12. Roschuk, T., O.H.Y. Zalloum, J. Wojcik, and P. Mascher,
Luminescence from Si nanoclusters
formed in silicon oxide and silicon nitride based materials,
NanoForum CANADA, University of
Waterloo, Waterloo, Ontario, Canada, (June 18-June 20
2007).
13. Roschuk, T., J. Wojcik, O. Zalloum, and P. Mascher, The
effects of deposition parameters and
annealing treatments on the structure of Si-rich silicon
nitride and oxynitride thin films, 212th
Electrochemical Society Meeting, Washington, DC, USA, (7-12
October 2007).
14. Roschuk, T., O.H.Y. Zalloum, J. Wojcik, and P. Mascher,
Structural and luminescent properties
of Si nanoclusters, 19th Canadian Materials Science
Conference, McMaster University,
Hamilton, Ontario, Canada, (June 20-22 2007).
15. Blakie, D., O.H.Y. Zalloum, J. Wojcik, E.J. Irving, A.P.
Knights, P. Mascher, and P.J. Simpson,
Positron spectroscopy of defects in ion-irradiated
erbium-doped silicon rich silicon oxide
luminescent thin films for silicon photonics, XIVth
International conference on positron
annhilation, McMaster University, Hamilton, Ontario, Canada,
(July 23rd and July 28th 2006).
16. Comedi, D., O.H.Y. Zalloum, J. Wojcik, and P. Mascher,
Light emission from hydrogenated and
unhydrogenated Si-nanocrystal/Si dioxide composites based on
PECVD-grown Si-rich Si oxide
films, 210th Electrochemical Society Meeting, Cancun,
Mexico, (October 29-November 3 2006).
17. Heng, C., O.H.Y. Zalloum, J. Wojcik, and P. Mascher,
Photoluminescence from Er-doped Si-rich
SiO2 films: A two-step annealing processes to control
efficient light emission from both Er ions
and nanostructures, Group IV Semiconductor Nanostructures
symposium, Boston, MA, USA,
(November 27-December 1 2006).
18. Roschuk, T., D. Comedi, O.H.Y. Zalloum, J. Wojcik, and
P. Mascher, Structural, electronic, and
optical analysis of luminescent Si-nanocrystal systems, 2006
MRS Fall Meeting, Boston, MA,
USA, (November 28-December 2 2006).
19. Roschuk, T., D. Comedi, O.H.Y. Zalloum, J. Wojcik, E.
Chelomentsev, M. Flynn, and P. Mascher,
Properties of Si nanocrystals formed in inductively coupled
plasma CVD grown SiOx thin films,
209th Meeting of the Electrochemical Society, Denver, CO,
USA, (May 7-12 2006).
20. Roschuk, T., M. Flynn, J. Wojcik, O.H.Y. Zalloum, D.
Comedi, and P. Mascher, Optical
properties of silicon nanocrystal-based photonic materials,
Ontario Centres of Excellence
Discovery, Toronto, Ontario, Canada, (February 7 2006).
21. Blakie, D., O. Zalloum, J. Wojcik, E.A. Irving, A.P.
Knights, and P. Mascher, Erbium doped
silicon rich silicon oxide thin films deposited by
ECR-PECVD, Ontario Photonics Consortium
(OPC) Research Showcase/Workshop, Hamilton, Ontario, Canada,
(June 1 2005).
22. Blakie, D., O. Zalloum, J. Wojcik, E.A. Irving, A.P.
Knights, and P. Mascher, Erbium doped
silicon rich silicon oxide luminescent thin films deposited
by ECR-PECVD, Photonics North,
Toronto, Canada, (September 12 2005).
23. Comedi, D., Zalloum, O.H.Y., Irving, E.A., Wojcik, J.,
and Mascher, P., Enhanced
Photoluminescencefrom Nano-structured
Silicon-Rich-Silicon-Oxide (SRSO) Films Fabricated by
ECR-PECVD and Thermally Annealed in (Ar+5%H2), 13th Int.
Conf. “Nanostructures: Physics
and Technology”, St Petersburg, Russia, (June, 20-25,
2005).
24. Comedi, D., O.H.Y. Zalloum, E.A. Irving, J. Wojcik, and
P. Mascher, H Induced Effects on the
Photoluminescence from Silicon Nanostructures Obtained from
PECVD Grown SiyO1-y (y<1/3)
Thin Films Annealed in (Ar+5%H2), 12th Canadian
Semiconductor Technology Conference,
Ottawa, Canada, (August 16-19 2005).
25. Comedi, D., O.H.Y. Zalloum, E.A. Irving, J. Wojcik, T.
Roschuk, M.J. Flynn, and P. Mascher, X-
Ray diffraction study of silicon nanocrystals embedded in
SiO2 obtained by thermal annealing of
silicon rich silicon oxide thin films, 12th Canadian
Semiconductor Technology Conference,
Ottawa, Canada, (August 16-19 2005).
26. Mascher, P., T. Roschuk, J. Wojcik, M. Flynn, E. Irving,
and O. Zalloum, Optical properties of
nanostructures based on silicon rich silicon oxide (SRSO)
thin films, 207th Meeting of the
Electrochemical Society, Quebec City, QC, Canada, (May 15-20
2005).
27. Pi, X., O.H.Y. Zalloum, J. Wojcik, M. Flynn, A.P.
Knights, P. Mascher, A.D.W. Todd, W.N.
Lennard, and S.J. Peter, Formation and oxidization of
silicon nanocrystals in erbium-doped
silicon-rich silicon oxide, MRS Spring Meeting, San
Francisco CA, (March 28-April 1 2005).
28. Roschuk, T., Wojcik, J., Flynn, M., Irving, E.A.,
Comedi, D., Zalloum, O., and Mascher, P., A
Comparison of Luminescent Silicon Nanocrystals Formed in
Silicon Rich Silicon Oxide Thin
FilmsDeposited by ECR-PECVD and ICP-CVD, 13th Int. Conf.
“Nanostructures: Physics and
Technology”, St Petersburg, Russia, (June, 20-25, 2005).
29. Roschuk, T., J. Wojcik, M. Flynn, O.H.Y. Zalloum, and P.
Mascher, Pit-formation in amorphous
Si thin films after high temperature thermal annealing, MRS
Spring Meeting, San Francisco CA,
USA, (March 31 2005).
30. Roschuk, T., M. Flynn, J. Wojcik, O. Zalloum, E. Irving,
and P. Mascher, Luminescent Si
nanocrystalsformed within silicon rich silicon oxide thin
films, MRS Spring Meeting, San
Francisco, CA, (March 28-April 1 2005).
31. Roschuk, T., O.H.Y. Zalloum, D. Comedi, M. Flynn, J.
Wojcik, and P. Mascher, Optical
properties of nanocrystalline silicon and their potential
applications, 12th Canadian
Semiconductor Technology Conference, Ottawa, Ontario,
Canada, (August 16 -19 2005).
32. Roschuk, T., O.H.Y. Zalloum, D. Comedi, M.J. Flynn, J.
Wojcik, and P. Mascher, Optical
properties of Si-based materials, Trends in Nanotechnology,
Oviedo, Spain, (29 August-2
September 2005).
33. Gramatikov, B.I., O.H.Y. Zalloum, Y.K. Wu, D.G. Hunter,
and D.L. Guyton, Birefringence-based
eye fixation monitor with no moving parts, ARVO (Association
for Research in Vision and
Ophthalmology), Ft. Lauderdale, Florida, USA, (April 25-29
2004).
34. Guyton, D.L., O.H.Y. Zalloum, K.R. Gemp, D.G. Hunter,
and B.I. Gramatikov, Simplified
polarization birefringence technique for detecting eye
fixation, ARVO (Association for Research
in Vision and Ophthalmology), Ft. Lauderdale, Florida, USA,
(April 25-29 2004).
35. Roschuk, T., J. Wojcik, M. Flynn, O.H.Y. Zalloum, and P.
Mascher, Si-based thin films fabricated
through ECR-PECVD for photonic applications, Silicon-Based
Photonics Workshop, McMaster
University, Hamilton, Ontario, Canada, (November 2004).
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